#include "infrastructure/include/hash.h"
#include <stdio.h>
#include <string.h>
 
/* POINTER defines a generic pointer type */ 
typedef unsigned char *POINTER; 

/* UINT2 defines a two byte word */ 
typedef unsigned short int UINT2; 

/* UINT4 defines a four byte word */ 
typedef unsigned long int UINT4; 

#define PROTO_LIST(list) list 

/* MD5 context. */ 
typedef struct _MD5_CTX 
{ 
    UINT4 state[4]; /* state (ABCD) */ 
    UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */ 
    unsigned char buffer[64]; /* input buffer */ 
} MD5_CTX; 

/* Constants for MD5Transform routine. 
*/ 
#define S11 7 
#define S12 12 
#define S13 17 
#define S14 22 
#define S21 5 
#define S22 9 
#define S23 14 
#define S24 20 
#define S31 4 
#define S32 11 
#define S33 16 
#define S34 23 
#define S41 6 
#define S42 10 
#define S43 15 
#define S44 21 

static unsigned char PADDING[64] = { 
    0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 
}; 

/* F, G, H and I are basic MD5 functions. 
*/ 
#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) 
#define G(x, y, z) (((x) & (z)) | ((y) & (~z))) 
#define H(x, y, z) ((x) ^ (y) ^ (z)) 
#define I(x, y, z) ((y) ^ ((x) | (~z))) 

/* ROTATE_LEFT rotates x left n bits. 
*/ 
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) 

/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. 
Rotation is separate from addition to prevent recomputation. 
*/ 
#define FF(a, b, c, d, x, s, ac) { \
    (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac);\
    (a) = ROTATE_LEFT ((a), (s)); \
    (a) += (b); \
    } 
#define GG(a, b, c, d, x, s, ac) { \
    (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
    (a) = ROTATE_LEFT ((a), (s)); \
    (a) += (b); \
    } 
#define HH(a, b, c, d, x, s, ac) { \
    (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
    (a) = ROTATE_LEFT ((a), (s)); \
    (a) += (b); \
    } 
#define II(a, b, c, d, x, s, ac) { \
    (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
    (a) = ROTATE_LEFT ((a), (s)); \
    (a) += (b); \
    } 

#define TEST_BLOCK_LEN 1000 
#define TEST_BLOCK_COUNT 1000 

static void MD5Transform PROTO_LIST ((UINT4 [4], unsigned char [64])); 
static void Encode PROTO_LIST ((unsigned char *, UINT4 *, unsigned int)); 
static void Decode PROTO_LIST ((UINT4 *, unsigned char *, unsigned int)); 
static void MD5_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int)); 
static void MD5_memset PROTO_LIST ((POINTER, int, unsigned int)); 
static void MD5Init PROTO_LIST ((MD5_CTX *)); 
static void MD5Update PROTO_LIST ((MD5_CTX *, unsigned char *, unsigned int)); 
static void MD5Final PROTO_LIST ((unsigned char [16], MD5_CTX *)); 
static void MDTimeTrial PROTO_LIST ((void)); 
static void StringAddOne PROTO_LIST ((char *)); 
static void Encode PROTO_LIST ((unsigned char *, UINT4 *, unsigned int)); 
static void Decode PROTO_LIST ((UINT4 *, unsigned char *, unsigned int)); 

/* MD5 initialization. Begins an MD5 operation, writing a new context. 
*/ 
static void MD5Init( MD5_CTX *context ) 
{ 
    context->count[0] = context->count[1] = 0; 
    /* Load magic initialization constants. 
    */ 
    context->state[0] = 0x67452301; 
    context->state[1] = 0xefcdab89; 
    context->state[2] = 0x98badcfe; 
    context->state[3] = 0x10325476; 
} 

/* MD5 block update operation. Continues an MD5 message-digest 
operation, processing another message block, and updating the 
context. 
*/ 
static void MD5Update( 
                      MD5_CTX *context, /* context */ 
                      unsigned char *input, /* input block */ 
                      unsigned int inputLen /* length of input block */ 
                      ) 
{ 
    unsigned int i, index, partLen; 
    
    /* Compute number of bytes mod 64 */ 
    index = (unsigned int)((context->count[0] >> 3) & 0x3F); 
    
    /* Update number of bits */ 
    if ((context->count[0] += ((UINT4)inputLen << 3)) 
        < ((UINT4)inputLen << 3)) 
        context->count[1]++; 
    context->count[1] += ((UINT4)inputLen >> 29); 
    
    partLen = 64 - index; 
    
    /* Transform as many times as possible. 
    */ 
    if (inputLen >= partLen) 
 { 
        MD5_memcpy 
            ((POINTER)&context->buffer[index], (POINTER)input, partLen); 
        MD5Transform (context->state, context->buffer); 
        
        for (i = partLen; i + 63 < inputLen; i += 64) 
            MD5Transform (context->state, &input[i]); 
        
        index = 0; 
    } 
    else 
        i = 0; 
    
    /* Buffer remaining input */ 
    MD5_memcpy 
        ((POINTER)&context->buffer[index], (POINTER)&input[i], 
        inputLen-i); 
} 

/* MD5 finalization. Ends an MD5 message-digest operation, writing the 
the message digest and zeroizing the context. 
*/ 
static void MD5Final(unsigned char digest[16], /* message digest */ MD5_CTX *context /* context */) 
{ 
    unsigned char bits[8]; 
    unsigned int index, padLen; 
    
    /* Save number of bits */ 
    Encode (bits, context->count, 8); 
    
    /* Pad out to 56 mod 64. 
    */ 
    index = (unsigned int)((context->count[0] >> 3) & 0x3f); 
    padLen = (index < 56) ? (56 - index) : (120 - index); 
    MD5Update (context, PADDING, padLen); 
    
    /* Append length (before padding) */ 
    MD5Update (context, bits, 8); 
    
    /* Store state in digest */ 
    Encode (digest, context->state, 16); 
    
    /* Zeroize sensitive information. 
    */ 
    MD5_memset ((POINTER)context, 0, sizeof (*context)); 
} 


/* MD5 basic transformation. Transforms state based on block.   */  
static void MD5Transform(UINT4 state[4], unsigned char block[64])  
{
 UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; 
 Decode (x, block, 64);

 /* Round 1 */  
 FF (a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */ 
 FF (d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */ 
 FF (c, d, a, b, x[2], S13, 0x242070db); /* 3 */
 FF (b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */
 FF (a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */
 FF (d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */
 FF (c, d, a, b, x[6], S13, 0xa8304613); /* 7 */
 FF (b, c, d, a, x[7], S14, 0xfd469501); /* 8 */  
 FF (a, b, c, d, x[8], S11, 0x698098d8); /* 9 */  
 FF (d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */  
 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */  
 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */  
 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */  
 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */  
 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */  
 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */  

 /* Round 2 */ 
 GG (a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */  
 GG (d, a, b, c, x[6], S22, 0xc040b340); /* 18 */  
 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
 GG (b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */
 GG (a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */  
 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */  
 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */  
 GG (b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */  
 GG (a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */ 
 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */  
 GG (c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */
 GG (b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */  
 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */  
 GG (d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */  
 GG (c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */  
 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 

 /* Round 3 */  
 HH (a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */  
 HH (d, a, b, c, x[8], S32, 0x8771f681); /* 34 */  
 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */  
 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */  
 HH (a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */  
 HH (d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */  
 HH (c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */  
 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */  
 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */  
 HH (d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */  
 HH (c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */  
 HH (b, c, d, a, x[6], S34, 0x4881d05); /* 44 */  
 HH (a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */  
 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */  
 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */  
 HH (b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 */  

 /* Round 4 */  
 II (a, b, c, d, x[0], S41, 0xf4292244); /* 49 */  
 II (d, a, b, c, x[7], S42, 0x432aff97); /* 50 */  
 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */  
 II (b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */  
 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */  
 II (d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */  
 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */  
 II (b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */  
 II (a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */  
 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */  
 II (c, d, a, b, x[6], S43, 0xa3014314); /* 59 */  
 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */  
 II (a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */  
 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */  
 II (c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */  
 II (b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */  

 state[0] += a;
 state[1] += b;
 state[2] += c;
 state[3] += d;

 /* Zeroize sensitive information.    */
 MD5_memset ((POINTER)x, 0, sizeof (x)); 
 } 

 /* Encodes input (UINT4) into output (unsigned char). Assumes len is 
  a multiple of 4.   */
static void Encode(unsigned char *output, UINT4 *input, unsigned int len)
{
 unsigned int i, j;
 for (i = 0, j = 0; j < len; i++, j += 4) 
 {
  output[j] = (unsigned char)(input[i] & 0xff);  
  output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);  
  output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);  
  output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);  
 }
 } 

/* Decodes input (unsigned char) into output (UINT4). Assumes len is 
  a multiple of 4.   */ 

static void Decode(UINT4 *output,unsigned char *input,unsigned int len)
{
 unsigned int i, j;
 for (i = 0, j = 0; j < len; i++, j += 4)
 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | 
 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);  
 }

 /* Note: Replace "for loop" with standard memcpy if possible.  
 */  
static void MD5_memcpy(POINTER output,POINTER input,unsigned int len)
{
 unsigned int i;
 for (i = 0; i < len; i++)  
  output[i] = input[i];  
}

/* Note: Replace "for loop" with standard memset if possible.  
 */

static void MD5_memset(POINTER output, int value,unsigned int len)
{
 unsigned int i;
 for (i = 0; i < len; i++)
  ((char *)output)[i] = (char)value; 
}

/* Digests a string and prints the result. 
  */ 

char* md5(char *string)
{
    MD5_CTX context;
    unsigned char digest[16];  
    char output1[34];  
    static char output[33]= {0};  
    unsigned int len = strlen(string);  
    int i; 
 
    MD5Init(&context);  
    MD5Update(&context, (unsigned char*)string, len);  
    MD5Final(digest, &context);  
 
    for (i = 0; i < 16; i++)
    {
        sprintf(&(output1[2*i]),"%02x",(unsigned char)digest[i]);  
        sprintf(&(output1[2*i+1]),"%02x",(unsigned char)(digest[i] <<4));  
    }
 
    for(i=0;i <32;i++)  
    {
        output[i]=output1[i];  
    }
    return output;
}

